Combined chuck and drill extractor.



G. H. GILMAN.

COMBINED CHUCK AND DRILL EXTRACTOR.

APPucATmN men MA|6.1913.

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UNITED sTATEs PATENT oEEIcE.

GEORGE H.` GILMAN, or cLAREMoNT, NEW HAMPSHIRE, AssIGNoR, EY MEsNE AssIerN-v MENTS, `To SULLIVAN MACHINERY vCOMPANY, 0E -BosToN,2MAssAcHUsETTs, A

CORPORATION OF MASSACHUSETTS.

COMBINED icHUcK AND DRILL EXTRAcToR .Specification of Letters ratent.' Patented A1lg- 6,1918- Application filed May 16, 1913. SerialNo.176'7,9f74l.

To @ZZ/whom it may concern:

Be it known that I, GEORGE I-I. GILMAN, a citizen ofthe United.` States, and a resident of Claremont, Sullivan county, State of New Hampshire, have invented an Improvementjin Combined'Chuck and Drill Extractors', 'of which the following description,l Yin connection with the accompanying drawings, isa specification,likev characters on the drawings representing like parts. l

, This invention relates to ftool retainers for 'retaining the tool, or die, in tools of the ypiston ,hammerv type, and more especially, lthoughnot exclusively, tov a combined chuck and drillpextr'actor intended more particularly for use with drill steels having a shank yportion 'of uniform cross section and sometimescalfled shankless drill steels.

My invention will be best understood by .reference to the following specification, when taken' in connection with the accompanying drawings of one lillustrative embodiment thereof, while its'l scope will be more particu- `llarly pointed out in the appended claims.r

' In the drawings:

" Figure 1 is aplan of 'a portion of a rock drill ofthe hammer type embodying my in- 'Fig. 2,v looking toward the right.

Referring to the drawings, and to the embodiment of my invention which I have se- Ylectedfor illustrative purposes, I have there shownY the forwardportion of al rockdrill of the lfiammerV type embodying my invention,

K the same comprising a cylinder 6, mounted y inguide'ways of :a shell 7 of common form,

and provided with a-usual Yfeed-screw 8, It will beunderstood, however, that this invention is. not limited to hammer drills of' the mounted type, but is useful in all other types of hammer drills,` A hammer piston, 9 is mountedy toA reciprocate in/the cylinder 6,

and the latter is provided with a front cylinder head' 10, in which a chuck l1 is mounted to rotate. '.This chuck has a bushing 12,

Vprovided witha polygonal hole or perforation`13, toA receive a drill steel 14 ofy correy sponding cross sectional shape, having atits forward end usual cutting edges 15. l'I-Ierein, the drill steel isformed of hexagonal bar stock, but it will be understood that any ,form of drill steel Vmay be emsuitable ployed. f I I y As a means for limiting the inward motion of the drilll steel within the chuck, the latter may be provided with an abutment kcomprising two `oppositely placedy shoulders 16, and the striking end'vof the hammer piston9is providedwith v-a reduced portion 17,- having its opposite sides slabbed' off at 418fto` enter the aperture 19 between `the' shoulders 16, and thus deliver its blows against Athe inner end of the drill steel. Preferably, the

chuck is provided with suitable tool rotating mechanism, such for example as that shown in my Patent N o. 1,034,010, dated July 30,

1912. In this patent, the chuck is rotated 'l by means of a chuckring and ratchet mechanism operated by 4straight and `helical flutes on the hammer piston, the reciprocatory motion of the latter being utilizedto impart a step by step rotative movement to the chuck through a clutch rin and rollers. A complete illustration of t e rotating mechanism 1s not essential tomy present invention, and

I' have therefore shown simply a clutch ring 20, provided with rollers 21. Y The drill steel' 14 is normally loosely held inthe chu'ckbushing 12,\so asvto be capable 1 of unlimited outward movement, and during l the operation ofthe toolis struck upon its 'inner end by the hammer piston'in the-customary manner, thereby acting upon the rock with a vpercussive cutting action, and

being rotated step by step. y I As a means 'for `securing the drill steel in the chuck when it becomes necessaryV to remove the steelfrom thedrill hole, I may provide any suitable means at will to secure -the drill steel 4to itsv `holding means, but lherein I have providedl the chuck 11 and chuck bushing'12 with'a longitudinal slot 22 toreceive a wedgeV 23.; This wedge may be of any othersuitable form, but herein it.

is provided with linclined laterally projecting shoulders 24; mounted upon inclined guideways `25, formed on lthe chuck l1. A

ring, or lcollar,26 encircling the chuck at its forward end is provided with a guideway 27,

'parallel to theguideways 25, thus forming opposite guideways inclined forwardly and position by any other suitable means, but herein is split at 28, and is provided with a pair of ears 29, through which a bolt or stud 30 passes, while the chuck 11 and-its bushing 1Q are laterally recessed at 31-to receive the' bolt-'or stud, the latter-thus interlocking therewith, and being held against position,

c any `herein the wedge is provided adjacent its front and rear ends respectively with lugs movement longitudinally yof the tool.

f If desired, the wedge mightengage only one of the flat faces ofthe drill steel lil, but herein is provided with a V-shaped groove 32, adapted to t two adjacent angulai-ly disposed faces of the drill steel (see Fig. It will now be evident that when the wedge is retracted, as shown in Fig. 2, the wedge will clear the drill steel, as shown in Fig. 5, and will allow the latter free play within the chuck. When, however, the wedge is driven forward, it may be caused to grip the drill steel firmly, thus permitting theoperator to extract the drill steelfrem the hole by the use of the feed screw. It will also be seen that, when the wedge is in its forward or gripping position, any tendency to outward movementof the drill bitand consequently of the wedge, with respect to the drill chuck, will cause said wedge to engage tlie drill steel with an increased lpressure, thereby .automatically increasing the holding power of said wedge.

I preferably employ suitable means normally to hold the wedge in its rearinost so that it shall normally be ineffective to grip the steel. llVhile I may employ other suitable means for this r:'purpose,

33 and 34, the former serving to limit the rearward movement of the wedge, while the lug 34k serves to receive `the thrust of aspring 35 tending lconstantly to move the wedge lengthwise out of engagement with the tool. While the spring may be of any other suitable form or arrangement, herein it is in the form of a helically coiled spring, located-in a recess 36 provided in the collar 26.- lThe spring might, of course, bear directly against the lug 34, but preferably I provide a pin 37, slidably arranged within the recess 36, and abutting at its rear end against the'lug 34. The latter may serve to receive the blows of a han'imer, whereby the wedge is driven forward by the operator against the tension of theV spring 85, and is thus caused to clamp the drill steelrigidly inthe chuck bushing. After the drill` steel has been,

` backed out of the drill hole, the drill steel may be removed by simply strikingl the wedge at its'front end, and driving it rear-` wardly, whereupon it will be held inits rearmostposition by thel described fspring, and the drill steelmay be freely withdrawn.

W'hile I have herein shown and described mally permitting of, it is to be understood that the invention Vis limited 'neither vto Athe mere details or relative arrangement of parts, nor to its specific embodiments herein shown, but; that eXtensive deviations from the illustrated form or embodiment ofthe invention may be made, without departing from the principles thereof. y

Having thus described my invention, what I claim and desire by Letters Patent to procure is n A v 1. The combination, in a rock drilling machine, of a drillubit having a shank of uniform section, Ameans for hammering the rear end of said drill bit, meansfor loosely holding said drill ybit to permit the same normally to bemoved endwise, and means to secure,L said drill ,bit to said holding means and having provision rendered effective by said vdrill-bit automatically to increase the holding power of said drill-bit securing means. l

2. An apparatus of the class described, comprising, in combination, a percussive tool, means for holdingv the tool while-normally permitting the saine to be `withdrawn freely, means for hammering the rear end` ofthe tool,l and'means at will toprevent said tool from being withdrawn, thelast mentioned means having provision forI causing any outward tendency .of saidrtool to increase the eectiveness toprevent such withdrawal. y y i l v 3. An apparatus of the class described, comprising, in combination, a percns'sive tool, means for holding said'tool while nor. mally permitting the same to be withdrawn freely, means 'for hammering the. lrear-...end of the tool, and axiallyjmovable frictional means at will to secure said toolin saidholding means. l l, I 110 4. An apparatus ofthe'classdescribed, comprising,.in combinatioin a percussive tool, means for holding `.said tool while norl thesaineto be withdrawn freely, means for hammering the rear end of` l115 lsaid tool, means at will to secure said tool,

and yieldingmeans constantly tending-to render the last-mentioned-means inefectiye i to securefthe tool.

. comprising, in combination, a percussive tool, means for loosely holding said tool, means for hammering the rear end of said tool, means forming guideways inclined with respect to the side of the tool, and a wedge mounted to slide in said guideways into and out of position to secure the tool.

8, An apparatus of the class described, comprising, in combination, a percussive tool, a tool holding chuck in which the toolv is loosely mounted for endwise movement in the normal operation of the tool, said chuck being provided with a longitudinal slot, and a Wedge mounted in said slot and engageable with said tool to secure the same in said chuck. Y

9. An apparatus of the class described, comprising, in combination, a percussive tool, a tool-holding chuck in which said tool is mounted for endwise movement in the normal operation of the tool, said chuck being provided with a longitudinal slot and with a guideway inclined forwardly and inwardly toward said tool, a collar secured to said chuck and provided with a guideway parallel to the first-mentioned guideway, a wedge mounted to slide in said guideways, and means for holding said Wedge in a rearward position.

10. An apparatus of the class described comprising, in combination, a percussive tool, a tool-holding chuck in which said tool is mounted for endwise movement in thenormal operation of the tool, said chuck being provided with a longitudinal slot'and with a guideway inclined forwardly and inwardly toward said tool, a collar secured to said chuck and provided with a guideway parallel to the rst-mentioned guideway, a Wedge mounted to slide in said guideways and provided with lugs adjacent its front and rear ends, respectively, at opposite sides of said collar, said collar being provided with a spring chamber, a pin mounted to slide in said chamber, and a spring in said chamber arranged to exert a rearward pressure on said pin.

11. The combination, in a rock drilling machine, of means for loosely holding a drill bit to permit the same normally to be moved endwise, and means to secure said drill bit to said holding means and having provision rendered effective by said drill bit automatically to increase the holding power of said drill bit securing means.

12. The combination, in a machine of the Y character described, of means for loosely `holding a percussive tool to permit the same normally to be moved endwise, an axially movable wedge for securing said tool against endwise movement, and a spring for normally holding said wedge in non-securing position.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE I-I. GILMAN.

Witnesses: f

WILLIAM E. HALE, M. ALEX. RICE.

@spies of this patent may be obtained for ve cents each, by addressing the Commissioner of ratontn,

Washington, D. G. 

